Portable display device



FIG. 1 is a perspective view of a portable display device showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a perspective view thereof, shown in an alternate position; and,

FIG. 9 is an additional view of FIG. 8 but showing additional unclaimed subject matter.

The broken lines shown in the drawings represent portions of the portable display device which form no part of the claimed design. 

The ornamental design for the portable display device, as shown and described. 